Must be one rare sombeech

Jarlaxle said

However: the "large jernal" 327 is the same as a 350 block...which is quite possibly what it is.

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Yes, that's what I was thinking. Very easy to make a 4-bolt 327 with a large-journal 327 crank. Don't know if they were ever factory-made, but I don't recall ever seeing or hearing of one, even a 375 H.P.